bpf: Fix linker optimization removing kfuncs
Status from this message: This series was applied to bpf/bpf.git (master)
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- v2 Latest2 patches 9 repliesApplied 2/2
- v12 patches 2 repliesSuperseded
Patches in v2 All 2 applied
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | compiler_types.h: Define __retain for __attribute__((__retain__))include/ | +23 | 5 replies | Applied |
| 2/2 | bpf: Harden __bpf_kfunc tag against linker kfunc removalinclude/ | +1 | 4 replies | Applied |
Reviews trailers per patch
1 of 2 patches has a Reviewed-by or Acked-by.
| Patch | Jiri Olsa |
|---|---|
| 1/2 | |
| 2/2 | T-b R-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH bpf v2 0/2] bpf: Fix linker optimization removing kfuncs
This patch series fixes unwanted stripping of kernel kfuncs during linker optimization, as indicated by build warnings from resolve_btfids e.g. "WARN: resolve_btfids: unresolved symbol ...". This can happen because the __bpf_kfunc macro annotating kfunc declarations is ignored during linking.
Patch 1 adds support for the compiler attribute "__retain__", used to avoid linker garbage cleanup. Patch 2 then updates __bpf_kfunc to use this attribute when LTO builds are enabled.
Build-tested locally against mips64el with gcc 13.3, and run through upstream kernel-patches/bpf CI.
Tony Ambardar (2):
compiler_types.h: Define __retain for __attribute__((__retain__))
bpf: Harden __bpf_kfunc tag against linker kfunc removal
include/linux/btf.h | 2 +- include/linux/compiler_types.h | 23 +++++++++++++++++++++++ 2 files changed, 24 insertions(+), 1 deletion(-)
Signature · 5 lines
v2: - move __retain macro to compiler_types.h (Miguel Ojeda) -- 2.34.1